On Wed, 20 Feb 2008 19:13:11 +1100, "hemyd"
put finger to keyboard and composed:

Batteries are quite complex these days, with feedback circuitry of all sorts
(I'm no expert on batteries). I read once that most laptop batteries fail
not because of bad cells, but faulty circuitry.

Henry Mydlarz
Australia

I believe "smart" batteries have a coulomb counter which maintains an
accurate record of the state of charge.

See http://en.wikipedia.org/wiki/Smart_Battery_Data

The interface is I2C aka SMBus in PC terminology.

See http://en.wikipedia.org/wiki/System_Management_Bus

- Franc Zabkar
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